Those who played games from the Half-Life series may remember a blue-suited (maybe purple) guy who was always around somewhere as if he were observing you. At the end of each episode / sequel the main character, Gordon Freeman, had some interaction with him.

3 Answers
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There is not a clear explanation of this. There's not really even a good solid HINT of this. This is entirely deliberate on the part of the game developers - they haven't revealed SQUAT about this guy.

The Nihilanth was of the opinion he wasn't human, though: "You are man. He is not man."

There's a pretty good summary of everything we have at the Half-Life Wikia but I doubt you'll learn anything you didn't from playing the games (except possibly locations he shows up that you missed him).

"You are man. He is not man." <-- when did this happen? I don't remember. Why do you think that Nihilanth is talking about him?
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Adam AroldJun 1 '11 at 13:53

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@edem - The wiki calls this out as well, I'd actually forgotten about it until I read that. It's one of the telepathic messages you hear from the Nihilanth on Xen in the first game - they're fairly hard to understand IMO. The assumption is simply because, well, who else would he be talking about? It's awfully random to just be about one of the big monsters and the tense is awfully odd to be talking about himself, since he uses 'I' at another point in the game.
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ShinraiJun 1 '11 at 14:19

Sorry to bump this question, but there are some things i'd like to add and that no one seemed to notice:

In HL2: EP2, after you bring back the antlion larvae to heal alyx, gman starts talking with you for the last time in the series, mentioning something like "he wished he could do more than keep an eye on gordon and alyx, but he needed to ... FOLLOW SOME CERTAIN RULES."

This statement still bugs me since the first day i heard it, because i always thought on gman as a "superior entity" or something, but that statment may mean he's following orders of someone... or something else. Could he be an advisor's spy? After all, he KNEW that Eli would be attacked by advisors since he whispered into alyx mind to tell her dad to "prepare for unforseen consequences". And Eli DID meet Gman before.

Also, there's still another important fact. There's still a theory that when gordon pushed that cart away in black mesa, nothing of what we know happened in real life, but inside his mind, he could be suffering of a sickness where you "dream awake".

And BEFORE we get to that chamber, all that gordon sees are guards and scientists... but a little before reaching the chamber, he sees gman talking to a scientist. Meaning he was the ONLY DIFFERENT THING in entire black mesa, and maybe his image buried so deep into Gordon's mind that when he falled into sickness... he sometimes sees gman in the background, or even talking to him.

Well, there's really no proof of any of these theories, but Half life canon is always fun to argue about.